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f I 1 o? I l y* @turisti @there riduttori @time i@ J neig) 3 Letters.Patent No. 78,565, dated June 2, 1868.

lld'FROVEMENT 1N VISES.

dige tlgctule oferto tu in these tctter @that mit nuttig tot nf itsstun.

TO ALL WHOM I'l MAY CONCERN:

Be it known that I, QUIMBY'S. BACKUS, of Winehendon, in the county ofWorcester, and State of Mossaehusetts, have invented certainyimprovements in Vises, of which the following is a full, clear, undexact description, reference being had to the accompanying dra-wings,making part of this specification, in which- Figure 1 is a perspectiveview of a rise, with my improvements appliedthercto.

Figure 2 is a longitudinal vertical section through the centre of thesuine.

Figure 3 is e transverse section on the line fc rc offig. l, when thevise is closed.

Figure 4 is a transverse section ou the line 1,1 g/ of iig. 2.

ywhen articles oi wood, metal, or other material are held in place whileboing operated upon between the jaws of' tho various vises oi theordinary construction, the shavings or filings which resnlt therefromi'all upon the screw-shaft by which the movable'jaw is opera-ted, andare carried forward into its screw-nut, thereby cous ing it tobespeodily worn away, and frequently so obstructing both the screw-shaftand its nut as to require cleaning before the movable jaw can be mode toslide in its grooves or ways, as required.

To overcome those didiculties is the object oi' niy invention, whichconsists in one or more tubes, or one oi' more segments of a tube ortubes, or other covering for shielding the portion of the screw-shaftbetween the jaws., exposed to the shavings'or iilings, or for enclosingor covering the top only, or both the top and sides, of the portion ofthe screw-shet`t thus exposed; by which construction I am enabled so tocovcr'and protect the screw-shaft as to prevent any of the refusematerial from lodging upon it, and being carried thereby into thescrew-nut of the movable jow. Y

To enable others slrillcd'in the art to understand and use my invention,I will proceed to describe the manner in which I have carried it out.

In the said drawings, A represents the base of a. vise, which may besecured to a bench or table by means of a. bolt, (not shown,) the headof which tits into the longitudinal groove a, in the under side ofthebase, from one end of which rises the stationary jow B.

C is the movable jow, which is caused to' slide in grooves Zi inthesides of the base, A, by revolving the screw-shaft D, the smoothportion, c, of which rests in the stationary jxiw B, and passes througho screw-nut, d, formed in the interior of the movable jow C, the seidshaft being prevented, while revolving in the direction of the arrow v,from turning outl of its stationary jaw by means of a stop, e, againstwhich the sides of an annular groove,f, are brought in Contact, thescrew-shaft also being prevented, when revolving in the direction of thearrow w, from advancing, by its shoulder g being,l brought against theoutside of the stationary jaw B.

To the inside of the jaw C is secured a circular tube, it, which is ofsuilicient diameter to enclose the portion of the screw-shaft D, andallow it to turn freely therein. On the lower side of the exterior ofthe periphery of the ytube 7L is formed a. projection, 5, which fitsinto a. longitudinal slot, 6, formed in a. second tube, z', of sim; ilarform, but of slightly greater diameter than that` ot' t, to admit f theformer, z', v sliding over it. k is another tube, secured to the insideof the jaw B, of a little larger diameter than that of z', in order thatthe lutter tube moy be slid within it. vThe tube 7c is also providedwithad longitudinal slot, 7, for the reception of u projection, 8, onthe under side of the exterior of the tube t'.

When the movable jew is to be separated or moved farther from thestationcryjaw, for the reception ofthe object to be operated upon, the'handle of the screw-shaft is revolved in the direction of the arroww,and the tube L is drawn out from within the tube i, until the projection5 .strikes against the end of the slot 6, formed in the tube z', whenthe lutter tube is drawn out from within the tube la, until theprojection 7 on the tubez' comes in contact with the end of the slot 8in the tube 7c, and thescveral tubes are thus drawn out their wholelength over the screw-shaft, thereby covering it so as to preclude thepossibility of shavings, &c.,ifa.lling thereon.

`When the movable jow is closing up to the stationary jow, the severaltubes, 7L t' 7s, tit into cach other, similar to Ithe sections of otelescope.

Instead of making the tubes h and c separatefrom their respective jaws,and afterward securing them thereto, each of these tubes mayr beform'edin one and the same piece with its jaw, and the form of the covering ofthe shaft, as well as the material of which it is composed, may'bevaried; for instance, each jaw'may be provided with a slot above thescrew-shaft, for the reception of a flat or curved strip, the endsof'ivhehare free to slide as the jaws are openedox` closed.

I am aware that screw-shafts of vises have been covered, by means oftubes, to protect them from the shavf ings,vflngs, and other dirt; butthese tubes have been heretofore made in a single piece, reqniring alength of the vise sucient for their convenient operation andprotection. My inventionv consists in providing visos with a sectionaltube, composed of three parts, which slide one within the other, toe'ect the same purpose, and to thus save space, andv render the visemore compact.

Claim.

What I clain, and desire to secure by Letters Patent, is- The method ofprotecting the screw-shafts of vises with the sectional tubes h, z', andk, arrang'll'and oper ating substantially asdescribed. Y

QUIMBY S. BACKUS.

Witnesses:

SIDNEY FAIRBANK,

E. S. MERRILL.

